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Series 90 Inspections and Adjustments 8
8.3 Motor Adjustments
Shim Adjustable Charge
Pressure Relief Valve
(Motor)
8.3.1 Charge Relief Valve Adjustment
Motor charge relief is explained in Sec. 2.6.1.
1. To measure motor charge pressure, install a 50
bar (or 1000 psi) pressure gauge in the motor
charge pressure gauge port (M3). Also install a
gauge to measure case pressure. Operate the
system with the pump in stroke (forward or re-
verse) when measuring motor charge pressure.
2. The following table shows acceptable motor charge
pressures for some nominal charge relief valve
settings (see model code at right). These pres-
sures assume a reservoir temperature of 49
°
C
(120
°
F). They are referenced to case pressure
and assume a one pump/one motor system.
Screw Adjustable Charge
Pressure Relief Valve
(Motor)
Charge Pressure Gauge Port (MF)
90000248
90000263 90000265
3. Earlier production Series 90 motors are equipped
with a shim adjustable charge relief valve. Shim
kits are available as service items. Adjustment of
the charge pressure is accomplished by removing
the plug (7/8 inch hex) and changing the shim
thickness behind the spring. The plug for this type
charge relief port should be torqued to 68 Nm (50
ft•lbf).
Later production Series 90 motors are equipped
with an external screw adjustable charge relief
valve. Adjustment of charge pressure is accom-
plished by loosening the lock nut (with a 1-1/16
inch hex wrench for 030 through 100 units, or a 1-
5/8 inch hex wrench for 130 through 250 units),
and turning the adjustment plug with a large
screwdriver or a 1/2 inch hex wrench. Clockwise
rotation of the plug increases the setting, and
counterclockwise rotation decreases the setting
(at a rate of approximately 3.4 bar [50 psi] per
turn). The lock nut for this type charge relief valve
should be torqued to 52 Nm (38 ft•lbf).
4. Once the desired charge pressure setting is
achieved, remove the gauges.
g n i t t e S e d o C l e d o M e r u s s e r P e g r a h C r o t o M
) e g n a R e l b a t p e c c A (
(
±
[ r a b 4 . 1
±
) ] i s p 0 2
r a b 0 1 ) i s p 7 1 1 ( r a b 1 . 8
r a b 8 1 ) i s p 3 3 2 ( r a b 1 . 6 1
r a b 0 2 ) i s p 2 6 2 ( r a b 1 . 8 1
r a b 4 2 ) i s p 0 2 3 ( r a b 1 . 2 2
r a b 8 2 ) i s p 8 7 3 ( r a b 1 . 6 2
r a b 0 3 ) i s p 5 3 4 ( r a b 0 . 0 3
Nominal Charge
Pressure Setting
90M055 NC 0 N
8 N 0 C6 W 00
NNN 00 00 24
e.g. “24” = 24 bar
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